Alpine S2-W12D4 S-Series 12" subwoofer with dual 4-ohm voice coils

Product info: 12" subwoofer with dual 4-ohm voice coils carbon fiber/polypropylene cone with HAMR rubber surround frequency response: 23-215 Hz power handling: 600 watts RMS (300 watts per coil) peak power handling: 1,800 watts sensitivity: 86.2 dB top-mount depth: 5.05" sealed box volume: 0.61-1.2 cubic feet ported box volume: 1.06-1.6 cubic feet grille not included warranty: 1 year Alpine S2-W12D4 owner's manual One 12" Dual 4-ohm voice coil subwoofer Trim ring (installed) Two 3" jumper cables (each has a single banana connector on each end) Subwoofer Application Guide (English/ French) On-line product registration information (English/ French/ Spanish) Warranty information (English/ French) Important Notice! (English/ French) Features and Specs Size 12-inch Impedance (Ohms) 2, 8 Cone Material Carbon Fiber/Polypropylene Surround Material Rubber Basket Material Steel Grille None included Free-Air No Dual Voice Coil Yes Sensitivity 86.2 dB at 1 watt Frequency Response 23 - 215 Hz Max RMS Power Handling 600 Peak Power Handling (Watts) 1800 Top Mount Depth (inches) 5 1/16 Bottom Mount Depth (inches) N/A Cutout Diameter or Length (inches) 10 5/8 Frame Width 12.5 Frame Length 12.5 Vas (liters) 51.5 Fs (Hz) 28.8 Qts 0.44 Xmax (millimeters) 15 Parts Warranty 1 Year Labor Warranty 1 Year Box Requirements Ideal Sealed Box Volume (cubic feet) 0.85 Minimum Sealed Box Volume (cubic feet) 0.61 Maximum Sealed Box Volume (cubic feet) 1.2 Ideal Ported Box Volume (cubic feet) 1.51 Minimum Ported Box Volume (cubic feet) 1.06 Maximum Ported Box Volume (cubic feet) 1.6 Port diameter (inches) N/A Port length (inches) N/A